Are Davis Cup matches counted as official matches for the players?
It is also important to note this from ATP Rankings in Wikipedia:
Davis Cup matches do count towards a player's official stats, head to head record.
But not all zone group matches do count.
e.g. Group IV Africa does not count.
Most of the time, by
Davis Cup people mean
Davis Cup Finals (
World Group up to 2019) but it is worth knowing it's a multi-layer competition.